Intel E7-8891 v2 CM8063601377422 User Manual

Product codes
CM8063601377422
Page of 504
Integrated I/O (IIO) Configuration Registers
302
Intel
®
 Xeon
® 
Processor E7-2800/4800/8800 v2 Product Family
Datasheet Volume Two: Functional Description, February 2014
14.3.5
DMIVC1RCTL
DMI VC1 Resource Control
Controls the resources associated with PCI Express Virtual Channel 1.
Type:
MEM
PortID:
8’h7e
Bus:
0
Device:
0Function:0
Offset:
0x20
Bit
Attr
Default Description
31:31 RW_LB
0x0
vc1e:
Virtual Channel 1 Enable  
0: Virtual Channel is disabled.
1: Virtual Channel is enabled. See exceptions below.
Software must use the VC Negotiation Pending bit to check whether the VC 
negotiation is complete. When VC Negotiation Pending bit is cleared, a 1 read from 
this VC Enable bit indicates that the VC is enabled (Flow Control Initialization is 
completed for the PCI Express port). A 0 read from this bit indicates that the 
Virtual Channel is currently disabled.
BIOS Requirement:
1. To enable a Virtual Channel, the VC Enable bits for that Virtual Channel must be 
set in both Components on a Link.
2. To disable a Virtual Channel, the VC Enable bits for that Virtual Channel must be 
cleared in both Components on a Link.
3. Software must ensure that no traffic is using a Virtual Channel at the time it is 
disabled.
4. Software must fully disable a Virtual Channel in both Components on a Link 
before reenabling the Virtual Channel. 
30:27 RV
-
Reserved  
26:24 RW_LB
0x1
vc1id:
Virtual Channel 1 ID  
Assigns a VC ID to the VC resource. Assigned value must be nonzero. This field 
can not be modified when the VC is already enabled. 
23:8
RV
-
Reserved  
7:7
RO
0x0
tc7vc1m:
Traffic Class 7/ Virtual Channel 1 Map  
Traffic Class 7 is always routed to VCm. 
6:1
RW_LB
0x0
tcvc1m:
Traffic Class / Virtual Channel 1 Map  
Indicates the TCs (Traffic Classes) that are mapped to the VC resource. Bit 
locations within this field correspond to TC values.For example, when bit 6 is set in 
this field, TC6 is mapped to this VC resource. When more than one bit in this field 
is set, it indicates that multiple TCs are mapped to the VC resource. In order to 
remove one or more TCs from the TC/VC Map of an enabled VC, software must 
ensure that no new or outstanding transactions with the TC labels are targeted at 
the given Link. 
0:0
RO
0x0
tc0vc1m:
Traffic Class 0 / Virtual Channel 0 Map  
Traffic Class 0 is always routed to VC0. 
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